摘要
利用仿射对应原理 ,计算斜轴测投影中平行于坐标面的圆投影所成椭圆的长短轴大小及方向 .根据计算结果 ,在 AUTOCAD绘图软件中启动画椭圆命令 EL L IPSE。
On the base of imitating firing correspondence principle, length and direction of long axis and short axis of the ellipse shaped in inclined axis measuring projection by projecting of circular parallel to coordinate surface are discussed. Furthermore, according to results these ellipses could be drawn expediently using ELLIPSE in AutoCAD.
关键词
仿射几何
投影术
斜轴测图
CAD
Computer graphics
Affine geometry
Shadow casting method
Deformable ratio
